Assuming I understand this mechanic, when you have an active beesting wound any other "chemical" wound like nettles/midge bites/leech burns produces another allergic reaction. I lost 50hhp in a swamp in the span of about 30 seconds because of midge bites, and 5x allergic reactions meant no str/agi for a good 10 hours. Asides from the inability to treat it specifically (if/when we get a treatment option I'm sure I wouldn't be at the stage of development to get it anyway), my instinctive reaction was to think it felt wrong. Surprise the mechanic exists or not, I don't think most people would expect it to work this way.
I'd argue that it should be limited to 1 allergic reaction per interaction type. Beesting + 5 midge bites + 1 leech burn = two reactions instead of six. If we want to keep the difficulty stable, the base HHP damage of the reaction could be lowered and stack instead. Multiple midge bites would keep 1 reaction stack, but take additional HHP for each new interaction instead. I'd even suggest scaling it for each interaction type, because 10hhp per midge bite is a bit much when it's easy to get caught for 5 bites in a short timespan if you're in water near them. 2hhp per midge, 5 per leech 10 per nettle? Those are the three I know about atm at least.